Stopping mechanism for sewing machines



H. 0-. MILLER.

STOPPING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED NOV. 12, I917.

1,428,648. Patenfiedsept. 12, 1922.

H. C. MILLER.

STOPPING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED NOV-12,1917.

z W 2. m 4 2 m 14 5 tn d4 I 3 x H m a D1 QM IQ NM \N N IN wNv IAQSASQSQ H. CLIVHLLER.

STOPPING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED NOV. i2, 191?.

1,428,6k8. v Patented Sept. 12, 1922.

4 SHEETS-SHEET 3.

111 gun r I I at; /0 61 0 J9 H. C MI LL ER.

STOPPING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED NOV. 1.2. 19:7.

1,428,648. PatentedSept. 12, 19221.

4 SHEETS-SHEET 4.

provide Patented Sept. 12, 1922.

U T STATES PATENT+0F-FICE. I

HENRY o. Mitten or we'rnnronn, YORK.

s rorrme MECHANISM roe snwnve ivrnoi inns.

Application filed November 12,1917. Serial no. 201,583.

The primary object of the invention is to provide a stopping mechanism for sewing machines which will, when the needle or bobbin threads break, or when the tension of the needle thread is insu'liicient to produce first class stitches, or when the bobbin thread is exhausted, stop the stitchingoperation and thereby prevent inferior work,

A further object of the invention is to provide automatic stopping means which is under the control of the tension of the needle thread.

A further object of the invention is to automatic stopping mechanism under the control of the needle thread, but is actuated when the bobbin has paid off all its thread, or in case the bobbin thread breaks.

The invention is primarily designed to operate on any one of the well-known hemstitching machines where a number of such machines are employed for hemming long lengths of cloth, and are all under the direction of a single operator. So longas the machines operate to peform the stitching as designed, the operators work consists primarily in attending to the supplying of thread and cloth. However, because of the intricate mechanism, and the high speed usually required, the thread is defective,

' breaks, or stitches skip, or the threads pay out, which results in the production of bad work and the puncturing or otherwise mar- .ring of the cloth. This occurs so frequently that the number of machines a single attendant can take-care ofis limited, as his time is consumed in quickly getting to the machines to prevent the cloth being ruined by the feeding devices before the mechanisms can be stopped.

" According to my invention, immediately any ofthe foregoing conditions arise, the ten sicn of the needlethread. is affected-and in bar, 5

the space of time ordinarily required for the needle to make a small group of stitches,

say four or five, the belt is shifted and the mechanism is stopped-before qappreciable damage is done.

In addition to providing mechanism for accomplishing the before mentioned functions, the nvention. comprehends improvements in the details of construction and arrangement of parts Which will be herein after described and particularly pointed out in the claims.

In the accompanying drawings z Figure l is an end view of a sewing machine illustrating my invention. Fig.2 is a plan view of the same. Fig. 3 is a view looking from the opposite end of the machine. i

Fig. l-is a detail perspective View of the}. automatic stopping mechanism. I 7 Figs. 5 and Gare plan views of the trip.

in illustrating the application of the invention, fl have shown conventionally a Singer hemstitching machine, but it is to be understood that the improvement is also applicable to sewing machines designed for producing plain stitches. s

The numeral 1 indicates a sewing machine head, 2 the driving shaft,2= thejhand wheel, 3 the fast and loose pulleys, ithe needle a tension check, 6 a bobbin and 5 the tension devices, all of these elements being old in the a r i I Mounted on one end of theldriving shaft 2, 1s a pinion 6, and meshing with same is a gear wheel 7, mounted on a stud 8, s1ipported on a bracketf), attachedto the head. Formed in the face of thegear wheel 7, is a cam 8 providedwith a dwell l1, and in advance of the camv 8*,and rotatable on the stud8, 1s a cam 12. Pivotedto the bracket 9, at 12, is abell crank lever 13, one member 14, of which extendsacross the face'of the gear Wheel 7, and: is provided With, a

roller 15, which engages the.c an 1 8, while the other member 16, of the bell crank lever extends downwardly from the pivot 112 and to its lower endispivoted a latch 17.. The

nose 18 of the latch extends toward the center of the head, and is pressed in this direction by a light spring 19, its movement on its pivot being limited by a slot andpin indicatedatQO. H i

Mounted on a rookshaftQl, extended through the bracket '9, isan arm '22, the

of the bracket 9, is a lever 31,

free end of which is beveled and terminates adjacent the nose 18 of the latch 17. On the opposite end of the shaft 21,is a handle 23, provided on its inner face with a strip of leather which engages the hand wheel 2*, to act as a brake when stopping the machine; Pivoted on a stud24, projecting from the bracket, is a belt shifting lever 25, its upper end being bifurcated and located adjacent the fast and loose pulleys, while its lower end, below the pivot, has attached thereto a stout spring 26, the tension of which tends to actuate the lever to normally hold the belt on the loose pulley. Extending laterally from the belt shifter 25, and through an opening in the bracket, is a projection 27, which engages the upper edge of the arm 22, to normally hold the leather on the handle in engagement with the hand wheel. i j

Mounted on a stud 30, near the lower end which eX- tends upwardly to the top of the bracket. Extending from the level-.31, is a roller 32, which lies in the path of movement of the cam l2, as shown in Fig. 3. Projecting rearwardly from the stud 3O, is an arm 33, which extends rcarwardly, and secured thereto is a plate 36, provided-on its upper edge with a flange 37, which. lies over the upper edge of the arm and forms a catch, which cooperates with a latch 38, fastened to the lower end of the bell crank member '16Q The plate 36, is provided with slots 39,

through which pass bolts 40, to provide means for adjusting the catch 3'7 with reference to the latch 38. A spring 35, connects the member 14, of the bell crank lever, and the arm 33, which holdsthe roller 15 in contact with the cam 8, and which also holds the roller 32 in contact with the cam 12. I I a hen the sewing machine is at rest the handle 23 is against the hand wheel 2, due to the fact that the spring actuated pro jection 2'7, of the belt shifter, is in engagement with the arm 22, consequently the brake is applied. At this time the beveled endof the arm 22, is out of the path of the noselS of the latch 17, and. is spaced therefrom. Under the tension of the spring 35, the roller 15 is caused to move downward in the dwell 11, which is timed to be locate z'l adjacent said roller when the machine is stopped, hence the latch 17is held out of the path of the beveled end of the army 32. The spring 35 also at this time serves'to draw the lever 31 toward the cam 12, wh ch likewise is shaped so as to hold the catch 37 below the latch 38, and pre ent engagement. The parts when in this position are at rest,

and areso shown in full lines in Fig. 8.

The mechanism just described, is employed to cause the stitching mechanism to operate so long as the work is perfectly usual thread talreup lever 2 formed; but if something happens to the threads, and the mechanism is to be stopped, supplementary means are employed to disengage the latches. 40 indicates a shaft which extends across the rear of the head and is mounted in the bracket 9, and a bearing 41. One end of this shaft is bent upwardly to form an arm 42, connected with the upper end of the lever 31, by a link 43, so that oscillatory movement of the arm is transmitted to the shaft 40. On the opposite end of the. shaft 40, is a lever 44, and adjustably secured to the upper end of the same is a tr gger 4 which extends through a guide slot 46, formed in a plate 47, fastened to the top of the head 1. pivot pin 48, extends through the plate 47, and to its upper end is attached a trip 49, formed with a slot 50, through which the upper end of the trigger extends.

One portion of the wall 5i of the slot is, when the trip is invone position, parallel with the slot 46, and then inclines therefrom to form a cam 52. The opposite wall of the slot is offset to form an abutment 53,

. against which the edge of the trigger is designed to engage in the operation of stopping the sewing mechanism, as will later appear. The lower end of the pivot 48 is provided with an angular extension 54, disposedso as to be engaged by the needle thread when the machine is inoperation. A light 1 tional spring 55, secured to the plate 47, en aces the top of the trip 49 to gently hold the latter in operative position.

livoted to the stem of the presser foot l is a lever 5'7, the forward end o which is provided with a depending finger or feeler 58, normally engaging in an opening 59, formed in the base, while the rear end of the lever is provided with a catch 60, designed to engage a pin 61, extending from the lower end of the lever 44.

In operation. the needle thread is passed through the usual tension devices on the sewing machine, and also p sed over the angularly disposed extension 54, of the pivot 48 and is trained through the eye of the g The ope tor now pulls the handle 28 awayfroni the hand wheel 2. and through the instrumentality of the arm and the extension 27, the belt shif or is rockedo-n i s pivot, and the belt isshifted to the Lpulley.

As soon as the gear whee] comn cnccslo rotate, the cam surface of the dwell ll rocks the bell crank lever 13 and the nose 18 of the latch 17 is positioned under the beveled end of he arm 5252, the latter having been positioned to permit of this action, when pulling the handle to start the machine. When the latch i7 the arm 22, the spring 19 assists in absorbing the shock, and at the same time permits of proper interlocking, or adjusting when the two elements --rocked back :and 'forth on its pivot.

are brought together. When in this -engaged position, the latch 38, on the lower end of the member 16, of the bell crank lever is so positioned as to permit of the catch 37., passing up behind it, when same is raised by the spring 35 when permitted by the position of the cam 12, the two cams being so timed as to rockthe bell crank lever, and subsequently oscillate the arm 38, in proper sequence.

The oscillating movement of the lever 31 is transmitted through the link '48, to the shaft 40, consequently to the trigger 45. As the trigger moves rearwardly, it engages the cam edge-52 of the slot50, and rocks the trip 19 :in the direction of the arrow .a, in Fig. '6. 1f the thread is properly .tension'ed it :acts on the .angular extension 54:, and restores the trip L9 to .its normal position, 'before the trigger, in its forward movement reaches the abutment 53. Hence the trigger oscillates in the slot and the trip likewise is oscillated by said trigger and :by the tension of the thread. Just so #long as the proper tension of the needle thread is maintained, and the stitches :are being properly formed, the trigger is oscillated back and forth in the slot, and the trip 49 is .l-ikewiie I s long as the trigger 19 is permitted to travel back and forth in the slot 50, the latches hold the power mechanism in operative re lation. That is, at the time the dwell11 comes under the roller 15, the cam 12 acts to permit inward movementof the arm 31 and during the interval the catch 37 is raised :behind the latch 38,. which prevents disengagementof the latch $17 from the end of the arm 22. This position of the parts is indicated in dotted lines in Fig. Therefore, as long as the proper tension is maintained on the needle thread, the trigger 19, will, acting on the cam edge v 52, rock the trip 49 in one direction, and the tension of thread will rock it in the opposite direction. In "each revolution of the ,gear wheel 8", the cam 12 will permit inward. movement of the arm 33, and the catch 37 will be presented behind the latch 38, to prevent the bell crank cam roller 15 falling into the dwell '11. The result is, as long as the thread is properly tensioned, and the stitches are uniform, the mechanism will continue to operate. Obviously, if the tension of the thread should be decreased, the angular extension 54, would not return "the trip to its normal position, and the mecha- .nism would stop.

Let it be supposed that the needle thread breaks, or becomes slack, and assume that the trigger has moved rearwardly and engaged the cam edge. 52. and moved-the trip on its pivot, and starts forward. As the tension of the thread against the angular extension a iislacking, the trip .remains .in

the position it wasmoved to by the rearward stroke of the trigger, as shown in :Fig. 6, and in the forward movement of the trigger it contacts with the abutment 53, as shown in dotted lines in Fig. 6. I'mmediately the forward movement of the trigger is arrested, the lever 31, is through the rod '40 and link 48, prevented from following the :Icam 12, that is from moving inwardly under. the influence of the spring .35, and consequently the arm .33, carrying the catch 37, is prevented from moving said catch into the path of movement of the latch 38. Now when the dwell '11 comes under the roller 15, the bell :crank lever. 13 is quickly rockedunder the influence .of its spring, and theinose 18 .of the .latch 17 is re-' moved from under the beveled :end of the aI- mQQL .As soon asithe latch 17 is removed, the spring 26, acting on the belt shifter rocks thela-tter, andtheextension 27 engaging the arm $2.2, rocks the .shaft 21, and

the handle 23, is forced against the hand wheel and the -mechanism is stopped. ,"Of

course, when the belt shifter is operated, the :belt is shifted to the loose pulley, which .is just slightly prior .to the application of the brake on the hand wheel.

l have, in the foregoing description, :em-

gphasized the fact that the. stopniechanism is tripped when the tension .on the needle thread isreduced, or when the. needle thread (breaks. "The invention, however, will operate to stop the mechanism when the bobbin .thread is exhausted from the Ebobbin, ,or when the bobbin thread breaks, or when stitohesskip.

When the bobbin thread isexhausted, the needle thread cannot be drawn into the cloth,

hence the tension .on thelneedlethread slackens and .the trip 49 operates :as previously described to trip (the "stop -mechan-ism. The

same ,is true when the bobbin thread breaks. The needle threads cannot be drawn into the cloth because of lack o-f tension on the bobbin thread, and it follows thatthe need-1e thread becomes slack, and the trip @will 'remain .in position to permit of engagement of the triggerwith the abutment, which will, :as previously described, stop the mechanism.

There are times when stitches skip, the to faulty timing of the parts, or other reasons,

and when this. occurs, iitgreflec'tszto the needle :thread, with the result that the tension is ifeeler drops iinto .the opening 59 and raises the hooked tend .in the ,path'of movement Fthe which holds the latter .in substantially the pin on the lower end of ;lever 44:,

same position as if, .the "trigger 45 .had :en-

uAiC/ I seen that I have provided positive means for automatically operating the'stopping mechanism when for any reason the stitching is faulty. The mechanism-is sotimed that the sewing mechanism is stopped'within a range equalling the distance of approximately four or five stitches, or before the cloth is damaged by being punctured by the continual thrust of the needle, or the continued reciprocation of the feeding bars under the presser foot.

While the improvement is especially applicable to hem-stitching machines, where wide stitches are usually employed, it is equally adapted to machines producing plain stitches.

The parts are so arranged that the actuation of the plate lends little'or no undue friction on the needle thread, and while the improvement operates on high speed machines, the plate isthrown out of action when the mechanism is stopped, allthe wear and shock coming on the parts which shift the belt, and release the belt shifter.

The extension or feeler 54, is located between the tension cl1eck5 and the main tension device 5, this location being desirable for obtaining the best work in the operation of the machine. 1

As shown, I prefer to arrange the mechanism so that the'main shaft of the sewing machine will make three or more revolutions to one revolution of the cam controlling the trippingmechanism..This action is obtained by providing the gear wheel 7 with three times as-many teeth as the teeth in pinion 6. By this means ample time is given to insure oi" the parts operating to stop the stitching mechanism.

The object in locating the feeler 54:, between the check and the main tension device is that when a predetermined length of thread is pulled by the feeler, the-check holds the thread against being pulled back by the Weight of the thread leading to the supply cone. Or the thread maybe drawn taut and stick on the cone before it is pulled off, and when the pull of the feeler is released and beforethe stitching mechanism could sew in the pulled off thread, the latter would draw back toward the cone, and in case the thread breaks at this time, or the bobbin thread runs out, the machine would-continue'rum 'ning. It is to avoid this condition that the parts are arranged as described. In other words this arrangement acts as a retainer for the supply of thread pulled-from the cone, and holds it until a predetermined number ofstitches have been formed in the fabric. The thread is somewhat elastic and it is essential that alittle more thread than is actually required be pulled oif. It is for this reason also that the main shaft be rotated several times to one of the cam controlling the tripping device. One or two stitches might be so limited that the elasticity of the thread would overcome the sewing in of the supply, and the machine would continue running even if. something happened to the bobbin thread.

WhatI claim is 1. in combination, stitch forming mechanism, power means, thread tension devices, means for shifting the power, a trip actuated in one direction by the tension of the thread, and means between the power shifting meansand the trip to move said-trip in opposition to the tension of the thread whereby. the trip is constantly vibrated during the stitching operation, said trip having an abutment to cause actuation of the power shifting means when the thread breaks or becomes slack. l

2.- A sewing machine including stitch forming mechanism, stopping and starting mechanism including a trigger, and a trip having an abutment with which the trigger engages to actuate the stopping mechanism when the thread breaks or becomes slack,

said trip being normally moved in one direction by the trigger and in the opposite direction by the tension of the thread.

3. A. sewing machine including stitch forming mechanism, means for operating same, means for actuating the last mentioned means, and a trip which is continually vibrated during the stitching operation by the'tension of the thread and operating actuating means, and adapted to be stopped to cause the actuating means to stop the sewing mechanism when the thread breaks or becomes slack.

at. In a sewing machine, the combination of a driving shaft, a trip which is constantly vibrated during the stitching operation and which is under the control of the thread of the sewing machine, power shifting means, a latch for holding the latter in operative relation, and connections between the tri and the latch whereby when the thread breaks or becomes slack the trip will actuate the latch and permit actuation of the power shifting means to stop the sewing machine.

5. In a sewing machine, the combination of stitching mechanism, means for operating the stitching mechanism, thread tensioning means, a stop motion, and cooperating elements continually vibrated during the stitching operation and operated by the means which operates the stitching mechanism and by the tension of the thread, said elements assuming position to stop the c0ntlnuousmovement when the thread breaks to actuate the stop motion to stop the stitching mechanism.

6. In a sewing machine, the combination of stitch forming mechanism, means for operating same, a stop motion, a trip actuated in one direction by the tension of the thread, said trip having an abutment, means for actuating the trip in the opposite direction, said latter actuating means being operated by the means for operating the stitching mechanism, the abutment causing the stopping mechanism to operate to stop the stitching operation when the tension of the thread is reduced or the thread breaks.

7. In a sewing machine, the combination of stitching mechanism and a stop motion therefor, means including a trip and a trigger both continually vibrated during the stitching operation for actuating the stop motion when the tension on the thread is reduced or the thread breaks, a lever vibrated with the trigger, a second lever, a feeler on one end of said second lever to reston the cloth, the opposite end of said second lever having a catch'to engage and hold the first lever and trigger against movement when the cloth passesfrom below the feeler, to thereby permit the stop motion to stop the machine.

8. In a sewing machine, the combination of stitching mechanism, a driving shaft therefor, a stop motion, atension trip actuated by the tension of the thread, a trigger co-operating with the trip means between the trigger and the driving shaft including a cam actuated latch, a cam actuated catch to periodically engage the latch, the latch holding the stop motion in position to permit operation of the stitching operation.

9. In a sewing machine, the combination of stitching mechanism, a stop motion in-' eluding a brake and a spring actuated belt shifter, means including a trigger for actuating the stop motion when'the tension of the thread decreases or the thread breaks, means for operating same including an 0scill-ating lever provided with a catch, a latch lever,-means for operating the levers, and an arm forming part of the stop motion and actuated in one direction by the spring actuated belt shifter, said arm being engaged by the latch lever to cause-continuous operation of the stitching mechanism, and said oscillating lever periodicallyengaging the latch lever.

10; In a sewing machine, the combination with stitching mechanism, a stop motion including a brake, a belt shifter, and an arm between the brake and belt shifter, a latch lever which engages the. arm to hold the brake off and the belt shifter in one position, a cam having a dwell, said cam actuating the latch lever, a lever having a catch, a cam timed to cause the catch to engage the latch lever at the time the dwell would rock the latch lever, a stop motion tripping device actuated by'the thread, and means connect ing the tripping device to the catch lever.

11. A two thread sewing machine, comprising a needle anda bobbin, means for puiling the needle thread from a source of supply, a check tension device for the needle thread, a main tension device for the needle thread, the needle thread pulling means acting between the checktension device and the main tension device, a stop motion device, the thread pulling means when the bobbin thread is exhausted being held in position to cause the tripping of the stop motion device. I

12. In a. two thread stitching mechanism adapted to use an upper thread and a lower thread to coact with each other to form stitches, the combination of a thread pullof device adapted to pull off a predeter mined supply of thread, a plurality of thread tension devices, the thread pull-oil device being located between the tension devices, a trip stop mechanism comprising two. rotary elements, two cams, and two cam le-. vers, one of the rotating elements making three or more revolutions to cause the other said element to make one revolution to rock the two cam levers, and means operated elements, two cams, and two cam levers, one

of the rotary elements making three'or more revolutions to cause the other said element to make one revolution to rock the two cam levers, and means operated when the upper thread breaks to destroy the relation of the .two cam levers and stop the sewing mechanism.

14. In a two thread stitching mechanism adapted to use an upper thread and alower thread to eoact with each other to form stitches, the combination of a thread pull off device adapted to pull off a predetermined supply of thread, thread tensioning devices, the thread pull-off device being located between the tension devices, a trip stop mechanism comprising two rotarylele: ments, two cams, and two cam levers, one of ,the rotary elements making three or more revolutions to cause the other said element to make one revolution to rock the two cam 1evers,and means operated when the upper thread breaks to destroy the relation of the two cam levers and stop the sewing mechanism.

15. In combination, stitch forming mechanism, power means, a thread tension device between the stitch forming mechanism and a source of supply of thread, a thread pull off between the tension device and the source of supply of thread whereby to pull off a predetermined supply of thread, and means between the pull oif and the power means to actuate the pull ofi immediately the previously pulled off thread is used, said means acting to disconnect the power means if the thread breaks or becomes slack.

16. In combination, stitch forming mechanism, powermeans, a thread tension device, a thread check between the tension device and the source of supply of thread, a thread pull off between the tension device and the thread check to pull off a predetermined supply of thread, and means between the thread pull off and the power means timed to actuate the thread pull off immediately the previous pulled off thread is used whereby to furnish a supply of thread for the succeeding operation if the stitching mechanism is operating correctly, said means acting to shut off the power if the thread breaks or becomes slack.

17. In combination, stitching mechanism, a take up member power means, stop and start mechanism, means intermittently operated by the power means for pulling off a definite supply of thread to supply the stitching mechanism, and connections be tween the thread pull off means and the power means for stopping the stitching mechanism if the thread breaks or becomes slack.

18. In combination, upper and lower stitch forming mechanism a take up memher, power means, means intermittently operated by the power means for pulling off a definite supply of thread to supply the upper stitching mechanism, and connections between the thread pull off means and the power means for stopping the stitching mechanism if the lower thread pays out or the upper thread breaks or becomes slack.

19. In combination stitch forming mechan sm a take up means, stop and start mechanism, means operated by thepower means for pulling off a definite supply of thread to be stitched in by the stitching mechanism between the operations of the pull off means,

said pull off means being retained inoperative position by the tension of. the thread, and connections between the thread pull off means and the power means for stopping the stitching mechanism if the thread breaks or becomes slack.

20. In combination. stitching mechanism, means for operating same. two cams oper ated by the last mentioned means, two cam leverscooperating with the cams, yielding means for normally pulling the two levers toward the cams whereby one of said levers will be operated when permitted by its cam, and engage the other said lever to prevent it engaging its cam and thereby prevent the brake operating, a tripper, cloth engaging means, said latter means being released when the cloth passes from under same, whereby to engage and hold the tripper and per mit disengagement of the two levers and the application of the brake to stop the mechanism. i

21. In combination, stitching mechanism, means for operating same, two cams operated by the last mentioned means, two cam levers cooperating with the cams, yielding means for normally pulling the two levers toward the cams whereby one of said levers will be operated by said yielding means as permitted by its cam, and engage the other said lever to prevent it engaging its cam and thereby prevent the brake operating, a tripper, clot-h engaging means, said latter means being released when the cloth passes from under same, whereby to engage and hold the tripper and cause disengagement of the two levers and the application of the brake to stop the mechanism.

22. In combination, stitching mechanism, 95 means for operating same, cams operated by the last mentioned means, cam levers cooperating with the cams, means for normally drawing the levers toward the cams to cause one cam to operate its leverand cause another lever to be out of engagement with its cooperating cam, and prevent operation of the brake, a tripper, cloth engaging means cooperating with the tripper, whereby to cause disengagement of the levers, and per- 105 mit application of the brake to stop the mechanism. I

23. In combination stitching mechanism, stop and start mechanism therefor, a brake, means governed by the movement of the ma- 110 chine. and adapted when free to act to set the brake, and means controlled by the thread when under normal tension for preventing release of said brake setting means for cooperation with the machine.

24. In combination, stitch forming mechanism, stop and start mechanism, a brake, mechanism governed by the machine when free to act to control the stop and start mechanism and set the brake, and means 129 controlled by the thread when under normal tension to prevent release of the brake controlling mechanism to stop the machine, said means being automatically set to release the brake controlling means in each revolu- 125 tion of the machine and reset by the thread under normal tension to avoid a release operation.

25. In combination, stitch forming mechanism, stop and start mechanism including a 130 brake, a member for controlling the position of the brake and stop and start mechanism, said member being arranged for operation to stop the machine in one position of the parts, and means, including a trip governed by the thread when under normal tension for holding said member against that movement tendingto stop the machine.

26. In a sewing machine, a stop and start mechanism including a brake, holding means to hold the stop and start mechanism inoperative, said holding means being capable of release at each cycle of movement of the machine a trip operative in one position to govern the holding means to permit cooper ation between such means and the machine for setting the brake, and means controlled by the thread. to remove the trip from such position at each cycle of operation when the thread is under normal tension and to permit it to remain in such position when the thread is under less than normal tension.

27. In a sewing machine, stitching mechanism, stop and start mechanism, means effective when free to actto release said step and start mechanism for stopping'the ma chine, a trip adapted in one position to interrupt normal movement of said means to stop the machine, and means operative by the thread when under normal tension to prevent an etfective mechanism interrupting position of the trip.

28. In combination, stop mechanism for a sewing machine including a governing memher having a normal predetermined movement in a cycle of operation to prevent application of the stop means, a trip responsive to such normal movement of the member and thereby set to interrupt a successive normal movement of such member, means responsive to the thread under normal tension to reset the trip to preventsuch interruption, and means whereby an interrupted movement of such member releases the stop mechanism for operation, whereby the trip is set to release the stop means and reset to prevent such release in each cycle of operation when the thread tension is normal.

In testimony whereof I affix my signature in the presence of two witnesses.

HENRY C. MILLER.

Witnesses r JOHN SINNoT'r,

ELEANOR F. JELF. 

